Die-stock.



H. W. OSTER.

DIE STOCK.

APPLIOATION FILED Amma, 1909.

965,403.. l Patented July 26, 1910.

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H. W. OSTER.

DIE STOCK.

APPLICATION FILED APR. ze, 1909.

965,403. Patented July 26, 1910.

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UNITE@ STATES PATENT FFIQF.

HERMAN W. osTER, or CLEVELAND, omdessIeNon To THE osinn.

COMPANY, or CLEVELAND, 0H

I0, A CORPORATION OF MANUFACTURING OHIO.

DIE-STOCK.

To all whom t may concern:

Be it known that I, HERMAN W. OSTER, a citizen of t-he United States,residing at Cleveland, in the county of Cuyahoga and State of Ohio, haveinvented a certain new and useful Improvement in Die-Stocks, of whichthe following is a full, clear, and exact description.

This invention is adapted more especially for use in geared die stocks,although certain features of the invention are useful in die stockswhich are not gear driven.

The primary invention is the described use of a spring' for drawing thedie head into the work holder to establish the lead.

Another feature of the invention is the described use of a cam platelatch which, w'hen the thread is nearly finish-ed, will be automaticallyknocked out of operative position and will then serve to so move the camplate that the dies will gradually recede and cut a tapered thread.

The invention is shown in the drawing and hereinafter described and isdefinitely pointed out in the appended claims.

In the drawing, F ioure l is a transverse longitudinal section of a diestock embodying the invention. Fig.y 2 is a sectional view' in the planeof line 2 2 on Fig. l. Fig. 3 is an end view of that side of the diestock on which the latch is secured,`this figure showing the latch (formost part in dotted lines) in position to prevent the turning of the camplate. Fig. 4 is a similar View showing, in dotted lines, the latchdrawn back and serving, in connection with other features shown in thisfigure, to t-urn the cam plate to cause the dies to recede. Fig. 5 is aside view of a fragment of the locking plate R.

Referring to the parts by letters, A represents the tubular head or bodyof the tool which has a rearwardly extended barrel a which telescopesover the tubular cylindrical barrel of the work holder B. This workholder has, in addition to said barrel, a con-.`

centric cylindrical barrel b outside of the barrel and at a sufficientdistance therefrom to leave between the barrel and the iiange an annularchamber C. On the rear end of the barrel a is an outwardly extendedflange a having, for a short arcual distance, and on one side, a narrowprojection e2. This fiange may be formed on or secured to the barrel a.A cap B is secured to the front Specification of Letters Patent.Application led April 26, 1909.

Patented uly 26, i910. Serial No. 492,122.

end of the flange and it is provided with l an inwardly extended flangeh2, which overhangs the flange a. D spring which embraces the rear endof the barrel a in the annular recess C between the fianges b2, a. Thenthe parts of the tool are in position to begin the work of cutting athread they are in the relative position shown in Fig'. l at which timespring D is compressed. At the same time the projection a2 is in frontof and engaging a spring pawl E mounted in the work holder and having ahead e which limits its inward movement. The inner end of this plungermay go behind the projection e2 of the flange a, and is in that.position, as shown in the drawing. Then so engaged with said projectiona2 said pawl prevents the spring D from moving the die head rearwardlyupon the work holder.

The dies E are mounted in radial ways in the front end of the head inthey are held by a cam plate J, which is mounted on the front end of thedie head, and is held thereon by a flanged ring Ii fixed to said diehead. The cam plate has scrolls j on its rear face which engage with therepresents a helical guide- A, wheredies, wherefore the turning of saidcam plate will move the dies in or out, as required. The cam plate hasan outwardly extended arm j', to the under side of which a latch plate Mis movably secured by means of the head n of a stud N, which screws intothe arm j and goes through a slot m in the locking plate. A spring I) ina spring-barrel m formed in this plate is pressed between the end ofthat barrel and the stud N. This plate is formed with a locking toe m2,'and with a notch m3 in the inner end of said plate. A stud N, screwedinto the projecting arm j passes through this notch. This toe m2 isadapted to engage in any notch r in the front edge of a curved lockingplate R, which is adjustably fixed to the side of the head, by means ofa screw T, which passes through a slot r in said plate R; A shaft U ismounted in bearings 3 in the outer end of a laterally projecting arm b4of the work holder. Fixed to this shaft is a long pinion u which mesheswith a gear a5 fixed to the die head. The locking plate R is locatedadjacent to this shaft.

In using the described tool, the parts thereof'are brought to theposition shown in Fig. l. Then the tool is passed over the end llO ofthe pipe or cylindrical bar to be threaded until the end thereof is inengagement with the dies H. rlhe work holder is then clamped to thework, which is generally held in a vise. rl`he cam plate J vis turneduntil the dies are moved, either out or in to bring them into properposition relative to the work. The plate R is moved to and secured inthe proper position for the engagement ot the latch plate in one of itsnotches. The latch plate is swung until its toe m engages with saidnotch. rlhen, by means of a crank put upon shaft U said shaft is turned,Through this means the die head is turned until the projection a2 passesbeyond the spring plunger E. Thereafter the spring D will act to drawthe die head rearward upon the work holder, and thereby establish thelead or cut of the die upon the work. This spring is preferably so shortthat it becomes inactive when the thread is well started.

When the head has been turned enough to have nearly finished cutting thethread an arm m3 is inserted in a socket in the outer end of the plate.This arm, when it comes in contact with the shaft U, will cause thelatch plate to be turned so as to withdraw its toe from the notch fr. Asthe die head is further turned this engagement will cause the cam plateto stand still, and thereby as the head is turned the dies will becaused to recede and therefore finish the thread o-n a taper.

Y represents a tubular cylindrical chip shield, which is lixed to thedie head. lts diameter and length is such that, as shown, it projectsinto and tits the barrel b, and an annular recess is formed between thebarrel a and chip shield for the end of barrel Z) to move as the dieholder moves rearward on the work holder. rl`his chip shield keeps thechips made by cutting the thread from interfering with the workingparts.

I claim- 1. In a die stock, the combination ot a work holder having acylindrical barrel and outside of that a cylindrical flange, a die headhaving a cylindrical barrel which telescopes over the barrel of the workholder and has at its inner end an outwardly extending annular flange,which flange has an outward projection which extends for a short arcualdistance, a spring pawl carried by the work holder and adapted to bemoved inward behind said projection, an inwardly projecting flange onthe cylindrical flange of the work holder, and a spring compressedbetween said liange and the.` annular flange on the barrel of the diehead.

2. In a die stock, the combination of a Work holder', a head whichtelescopes with the work holder and is rotatable thereon, radiallymovable dies carried by said head, a cam plate rotatably mounted uponthe head and having scrolls which engage with said dies and having anoutwardly projecting ear, a notched locking plate adjustably secured tothe die head, a latch plate mounted on said ear and having a toe adaptedto engage with a notch in said locking plate, a knock oit arm removablysecured to said latch plate, and a part carried by said work holder withwhich said knock out arm may engage as the die head is turned relativeto the work holder. i

3. ln a die stock, the combination of a work holder, a head whichtelescopes with the wor; holder and is rotatable thereon, radiallymovable dies carried by said head, a cam plate rotatably mounted uponthe head and having scrolls which engage with said dies and having anoutwardly projecting ear, a notched locking plate adjustably secured tothe die head, a latch plate having a slot and having at its inner end alocking toe and adjacent thereto a notch, a stud passing through saidslot and engaging with said ear and having on its under end a headengaging with said latch plate, a spring car ried by said latch plateengaging said stud, and a second stud fixed to said ear and passingthrough the notch in the inner edge of said latch plate.

et. ln a die stock, the combination of a work holder adapted to besecured upon the work and having a. laterally extended arm, a drivingshaft mounted in said arm and having secured to it a long pinion, a diehead mounted upon the work holder for rotative and longitudinalmovement, a gear fixed thereto and engaging with said pinion, diesmounted in said' die head, a cam plate controlling their position, alatch plate mounted on the cam plate for preventing the turning of thecam plate, and a knock out arm removably secured to said latch plate andadapted to engage with said shaft, whereby the latch plate is moved tothe unlatched position.

5. 1n a die stock, the combination ot a work holderl adapted to besecured to the work, a die head which telescopes over the work holder'and is adapted to move longitudinally and to rotate relative thereto,and a cylindrical chip shield iixed to the! die carrier and enteringthel tubular center of the work holder and engaging therewith.

In testimony whereof, l hereunto atlix my signature in the presence oftwo witnesses.

HERMAN WV. OSTER.

fitnesses F. C. BOND, R. B. TEwKsBURY.

